Improvement in bridges for supporting shaft-drilling machines



J. P. GRISGOM 8v J. FRITZ. BRIDGE FOR SUPPORTING SHAFT DRILLING MAUHINES.

Patented'Feb. 7, 1871.

@duid JOHN P. enis'coM, oir-PORT CARBON, AND J-oHN FRITZ, or MAHANOY PLANE, PENNSYLVANIA.

`Letters Patent No. 111,641, dated February f7, 1871'.

The Schedule referred to in these Lettere Patentsnd making ppn-t of.the 9eme. y

To all whom 'it may oonccrit:

Be it known that we, JOHN P. Gnlscoin, of Port ACarbon, Schuylkill county Pennsylvania, and JOHN FRITZ, of AltIahanoy Plane, in the county of Schuylkill, and in -the State of Pennsylvania, have invented certain new and useful Improvements in Bridge for Supporting Shaft-Drilling Machines; and do hereby declare that the following is a fullfclear, and c xact description thereof', reference being had to the accompanying. drawing and to'the letters of reference marked thereon making a part of, this specification.

The nature of our invention consists in the construction and arrangementof a bridge for supporting shaft-drilling machines, as willf be hereinafter fully set forth. y In order to enable others skilled in the art to` Awhich our invention appeitains to make and 'u'se the same, we will now proceed to describe its construction and operationreierring to the annexed drawing, in

which- Figure 1 is a bottom view;

Figure 2, a side View, part in section; and

Figure 3, an Aend view. of our bridge.

Our device is especially necessary in extending the use of diamond drilling-machines to the drillingr of holes in the bottom of shafts for blasting purposes. All attempts to accomplish this object havchitherto failed, for the reason that in attempting to use this classof machines in shafts they wereset right on' the surface of the rock, and it was tried to hold them I.to their work by the dead-weightof the machine. ,.This could not be done, because the pressure of the drill, which was necessary to make the diamonds cut therock, constantly tended tol liit the machine out of position, and when it stoodouany inclined surface the mere vibration produced by the rapid revolutions of of thedrill was suicient to shift it out ot' position or line with the hole, 'noxnatter how heavily it was weighted down, and as soon as the machine gets out of line with -the hole the drill binds and stops it.

The weight 'necessary to hold the drill to its work andthe uncvenness of the bottom of shafts make it impracticable to place the engine on the bottom, and our bridge or track is intended to overcome this diiculty. v

This frame or traveling-road is to suspend and support the drillfenginewhile-at-work, and allow it to be easily and quickly'moved from one position to another, and hold it in place while boring holes.

The road is to be fastened by screws or other means between the walls of the shaft, andthe drill-machine fastened onthe road,.so itcan be moved from one end to the other, and so drill a row of holes.

To accomplish thiseii-d a track, A, is constructed,

having two rails, u also formed and braced as to resist vibration, having in ,their ends extension pieces B B to allow of'lengthening' and shortening therails in case of inequality in the walls of' the shaft.

These extension pieces have'flanges at their upper sides, extending over andrestin'gupon the rails a a, as shown in iig. 3. .They are heldin place by means of bolts Z- d, locked by keys b i).

In the lower sides of -the extension pieces arc screws C C, run outby nuts e e against the-'walls to hold the track firm and keep it rigidly .in one lpositionnntil a row of holes is drilled.

The screws C C are grooved longitudinally, and a key orfeather, i, inserted. in the extension pieces B, fitting in said groove, keeps'tlie screws fromlturning, but allows them to move'out and in by the turning of the nuts o e. V-

W'e are aware that a frame has beeirused for. suppoiting a rock-'drilling machine, which frame has been provided at each end with one 'extension piece and screw, and we do, therefore, not claim -such device asv our invention.

Having thus fully described ourinvention,

What we claim as new, and desire to secure by Letters Patent, is-

The combination of the track or frame A, extension pieces'B B, and screws C C, all constructed as shown.

and described, and arranged so that there will-be two extension pieces, B, each with their screw C at each, end ofthe track, as herein setforth.

In testimony that we claim the foregoing we have hereunto set our hands this 22d day of October,

JOHN l. GRISCOM. JOHN FRITZ.

Witnesses: l

` Lewis Gmscom,

C. GRIscoM. 

